You are actually in the mahadasha of Rahu and antardasha of Mercury, you will enter the antardasha of Ketu from 29 Nov 2020. Rahu in Gochar is in your lagan and that is why you are facing health issues. This period is likely to impact you severely till September 2020. After October there will be some improvement on the health front.
You should do remedies of Rahu immediately to reduce the malefic effect of Rahu.
1. Read Hanuman Chalisa daily in the morning
2. Every Saturday donate something from your hands
3. Feed a hungry Dog.
4. Wear Emerald in Silver on your right hand little finger